VK on localhost?

Question

In contact with

I use vue-cli
How to make VK widgets work on LAN?
Tried and so
And did not understand how to do it in cli?
if I change the port to 80, then it doesn’t launch the npm dev command
PS
what does this command do and is it safe?)

sudo iptables -t nat -I OUTPUT -p tcp -d 127.0.0.1 --dport 80 -j REDIRECT --to-ports 8000

Answer 1

if I change the port to 80, then it does not start on the npm dev command

Port below 1024 EMNIP requires sudo

Answer 2

The command seems to redirect all outgoing requests from 80 to 8000, but this is not accurate.